diff options
author | Lv Zheng <lv.zheng@intel.com> | 2016-09-07 09:07:02 +0300 |
---|---|---|
committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-09-10 03:43:02 +0300 |
commit | c2d981aaed431c6af46f0a17907ed825946a5839 (patch) | |
tree | ccc56461c347eaaf7355ce37412b4e954a4168cc /drivers/acpi/acpica/nsutils.c | |
parent | de56ba95e8d6d760910711744a548b50b3a4262d (diff) | |
download | linux-c2d981aaed431c6af46f0a17907ed825946a5839.tar.xz |
ACPICA: Namespace: Add acpi_ns_get_node_unlocked()
ACPICA commit 3ef1a1bf5612fe1a629424c09eaaeb6f299d313c
Add acpi_ns_get_node_unlocked() to be used when ACPI_MTX_NAMESPACE is
locked. Lv Zheng.
Link: https://github.com/acpica/acpica/commit/3ef1a1bf
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Greg White <gwhite@kupulau.com>
Tested-by: Dutch Guy <lucht_piloot@gmx.net>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/nsutils.c')
-rw-r--r-- | drivers/acpi/acpica/nsutils.c | 66 |
1 files changed, 50 insertions, 16 deletions
diff --git a/drivers/acpi/acpica/nsutils.c b/drivers/acpi/acpica/nsutils.c index 784a30b76e0f..691814dfed31 100644 --- a/drivers/acpi/acpica/nsutils.c +++ b/drivers/acpi/acpica/nsutils.c @@ -662,7 +662,7 @@ u32 acpi_ns_opens_scope(acpi_object_type type) /******************************************************************************* * - * FUNCTION: acpi_ns_get_node + * FUNCTION: acpi_ns_get_node_unlocked * * PARAMETERS: *pathname - Name to be found, in external (ASL) format. The * \ (backslash) and ^ (carat) prefixes, and the @@ -678,20 +678,21 @@ u32 acpi_ns_opens_scope(acpi_object_type type) * DESCRIPTION: Look up a name relative to a given scope and return the * corresponding Node. NOTE: Scope can be null. * - * MUTEX: Locks namespace + * MUTEX: Doesn't locks namespace * ******************************************************************************/ acpi_status -acpi_ns_get_node(struct acpi_namespace_node *prefix_node, - const char *pathname, - u32 flags, struct acpi_namespace_node **return_node) +acpi_ns_get_node_unlocked(struct acpi_namespace_node *prefix_node, + const char *pathname, + u32 flags, struct acpi_namespace_node **return_node) { union acpi_generic_state scope_info; acpi_status status; char *internal_path; - ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname)); + ACPI_FUNCTION_TRACE_PTR(ns_get_node_unlocked, + ACPI_CAST_PTR(char, pathname)); /* Simplest case is a null pathname */ @@ -718,13 +719,6 @@ acpi_ns_get_node(struct acpi_namespace_node *prefix_node, return_ACPI_STATUS(status); } - /* Must lock namespace during lookup */ - - status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); - if (ACPI_FAILURE(status)) { - goto cleanup; - } - /* Setup lookup scope (search starting point) */ scope_info.scope.node = prefix_node; @@ -740,9 +734,49 @@ acpi_ns_get_node(struct acpi_namespace_node *prefix_node, pathname, acpi_format_exception(status))); } - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - -cleanup: ACPI_FREE(internal_path); return_ACPI_STATUS(status); } + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_node + * + * PARAMETERS: *pathname - Name to be found, in external (ASL) format. The + * \ (backslash) and ^ (carat) prefixes, and the + * . (period) to separate segments are supported. + * prefix_node - Root of subtree to be searched, or NS_ALL for the + * root of the name space. If Name is fully + * qualified (first s8 is '\'), the passed value + * of Scope will not be accessed. + * flags - Used to indicate whether to perform upsearch or + * not. + * return_node - Where the Node is returned + * + * DESCRIPTION: Look up a name relative to a given scope and return the + * corresponding Node. NOTE: Scope can be null. + * + * MUTEX: Locks namespace + * + ******************************************************************************/ + +acpi_status +acpi_ns_get_node(struct acpi_namespace_node *prefix_node, + const char *pathname, + u32 flags, struct acpi_namespace_node **return_node) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname)); + + status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + status = acpi_ns_get_node_unlocked(prefix_node, pathname, + flags, return_node); + + (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); + return_ACPI_STATUS(status); +} |